CN102505599B - Pavement designing method for guaranteeing service life of heavy-duty traffic asphalt pavement - Google Patents
Pavement designing method for guaranteeing service life of heavy-duty traffic asphalt pavement Download PDFInfo
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Abstract
The invention discloses a pavement designing method for guaranteeing the service life of a heavy-duty traffic asphalt pavement, comprising the following steps of: carrying out performance analysis and test on the asphalt pavement under different load conditions to obtain the stress, deformation and the fatigue characteristics of the material of the asphalt pavement; selecting design parameters of the asphalt pavement under the different load conditions; analyzing the mechanical characteristic of the structure of the asphalt pavement; constructing a calculation model for the service life of the asphalt pavement under a heavy-duty traffic condition; analyzing the influencing sensibility of the thickness, the rigidity, the subgrade modulus and the axle load of a pavement structural layer to the service life of the asphalt pavement and determining the calculation parameters of the calculation model for the service life of the asphalt pavement; checking the model, if the check is qualified, applying the model and primarily drawing the structure of the asphalt pavement; estimating the service life of the primarily drawn structure of the asphalt pavement according to the calculation model for the service life of the asphalt pavement under the heavy-duty traffic condition; and modifying or optimizing a primarily determined scheme and determining the design parameters of the structure of the asphalt pavement according to a calculation result.
Description
Technical field
The present invention relates to the bituminous pavement design for highway method in transportation, particularly a kind of pavement design method that guarantees service life of heavy-duty traffic asphalt pavement.
Background technology
The layered system that flexible pavement is comprised of multiple layers of different materials, resists the comprehensive function of traffic load and natural environment jointly, and the design result of flexible pavement should be able to guarantee travel safety and the comfortableness in service life.
The stressed of road structure is very complicated, various combination form, different-thickness and the modulus value of road structure chosen the stressing conditions difference that can make different decks, especially under heavy duty now, Overload Traffic effect, the stressed rule on road surface is different from the computational methods that standard provides, thereby should consider to affect each factor of Damages of Asphalt Road Surface comprehensively, the mechanical response rule of flexible pavement is calculated and determined to science, and the application life of reasonable prediction flexible pavement is most important.
The existing < < of China bituminous pavement design for highway standard > > (JTG D50-2006) regulation: bituminous pavement design adopts two-wheel group single shaft to carry 100kN as standard axle load, and has provided the calculating parameter of standard axle load.The disalignment of various vehicles is carried the equivalent axles that should be converted into standard axle load and is designed, provided reduction formula, and adopt road structure distortion and stressing conditions under the effect of carrying of elasticity stratiform theoretical system reference axis, the technical characteristic of ground surface material, parameter value are substantially based on linear elastic theory, and test shows that ground surface material can show non-linear nature under Heavy Traffic effect, need to pass through system test, investigate technical characteristic and the parameter value of ground surface material under Heavy Traffic condition.And then based on this, carry out road structure distortion and calculate with mechanical characteristic, analysis of material characteristic, axle carry the affect sensitiveness of characteristic on flexible pavement application life, and calculating influence coefficient, finally draws life forecast model.
Existing flexible pavement life forecast method all provides based on elasticity stratiform theoretical system substantially, can not reflect the nonlinear characteristic of ground surface material under Heavy Traffic condition, and in fact, under Heavy Traffic condition, asphalt pavement material has obvious nonlinear characteristic, according to the selected design parameters of existing method for designing and design road surface, it is under Heavy Traffic effect, and theoretical stress state of strain and actual conditions are not inconsistent.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of pavement design method that guarantees service life of heavy-duty traffic asphalt pavement, this method has been considered the nonlinear characteristic of ground surface material under fully loaded transportation condition, be convenient to reasonable selection pavement design parameter, built flexible pavement computation model in application life under Heavy Traffic condition, described below:
A pavement design method that guarantees service life of heavy-duty traffic asphalt pavement, said method comprising the steps of:
(1) under different loads condition, flexible pavement is carried out to performance evaluation and test, obtain the stress of asphalt pavement material and deformation characteristic, fatigue properties;
(2) according to the axle on the stress of described asphalt pavement material and deformation characteristic, fatigue properties and design road surface, carry situation, the design parameters of selected asphalt pavement material;
(3) according to the mechanical characteristic of the Analysis on Design Parameters asphalt pavement structure of asphalt pavement material;
(4) build flexible pavement computation model in application life under Heavy Traffic condition;
(5) analysis road structure layer thickness, rigidity, soil modulus, axle carry the sensitiveness on flexible pavement impact in application life, determine the calculating parameter of flexible pavement computation model in application life;
Wherein, described flexible pavement application life computation model calculating parameter comprise:
Surface thickness is to influence coefficient computation model in application life:
C
1＝0.9953e
0.0757(H-18)
In formula: C
1---surface thickness is to the flexible pavement influence coefficient in application life;
H---surface thickness (cm);
Surface layer modulus is to influence coefficient computation model in application life:
C
2＝1.03×10
-3(E-1200)+1.0016
In formula: C
2---surface layer modulus is to the flexible pavement influence coefficient in application life;
E---surface layer compression rebound modulu (MPa);
Subbase thickness is to influence coefficient computation model in application life:
C
3＝0.9937e
0.0656(H′-20)
In formula: C
3---subbase thickness is to the flexible pavement influence coefficient in application life;
H '---subbase thickness (cm);
Subbase modulus is to influence coefficient computation model in application life:
C
4＝1.002×10
-3(E
1-750)+1.0026
In formula: C
4---subbase modulus is to the flexible pavement influence coefficient in application life;
E
1---subbase compression rebound modulu (MPa);
Groundwork thickness is to influence coefficient computation model in application life:
C
5＝0.9824e
0.0828(h-40)
In formula: C
5---groundwork thickness is to the flexible pavement influence coefficient in application life;
H---groundwork thickness (cm);
Basic unit's modulus is to influence coefficient computation model in application life:
C
6＝8.581×10
-4(E
2-1500)+1.0024
In formula: C
6---basic unit's modulus is to the flexible pavement influence coefficient in application life;
E
2---basic unit's compression rebound modulu (MPa);
Soil modulus is to influence coefficient computation model in application life:
C
7＝0.0607(E
0-40)+0.9439
In formula: C
7---soil modulus is to the flexible pavement influence coefficient in application life;
E
0---Rebound Modulus of Subgrade (MPa);
Axle carries affecting computation model application life:
f(P)＝7.7776×10
19×P
-6.0559
In formula: .f (P)---axle carries the flexible pavement influence coefficient in application life;
P---axle carries (KN);
Set up flexible pavement computation model in application life under Heavy Traffic condition:
N
e＝C
1×C
2×C
3×C
4×C
5×C
6×C
7×f(P)
N
e＝0.9953e
0.0757(H-18)×[0.00103(E-1200)+1.0016]×0.9937e
0.0656(H′-20)×[1.002×10
-3(E
1-750)+10026]×09824e
0.0828(h-40)×[8.581×10
-4(E
2-1500)+1.0024]×[0.0607(E
0-40)+0.9439]×7.7776×10
19P
-6.0559＝7.5569×10
19P
-0.60569×(0.00103E-0.2344)·(1.002×10
-3E
1+0.2511)·(8.581×10
-4E
2-0.2848)·(0.0607E
0-1.4787)×e
0.0757H+0.0656H′+0.0828h-5.9866
(6) flexible pavement computation model in application life under described Heavy Traffic condition is tested, if upcheck, apply this model, execution step (7); If check is not passed through, re-execute step (4);
(7) just intend asphalt pavement structure;
(8) according to the application life of the first plan of flexible pavement computation model in application life assessment asphalt pavement structure under Heavy Traffic condition;
(9) according to the result of calculation in application life of asphalt pavement structure, revise or optimize and just determine scheme, determine Asphalt Pavement Structure Design parameter.
Described in step (9), according to the result of calculation in application life of asphalt pavement structure, revise or optimize and just determine scheme, determining that the step of Asphalt Pavement Structure Design parameter is specially:
If the result of calculation in application life of described asphalt pavement structure is consistent with selected design period, directly according to determining scheme at the beginning of described, determine described Pavement Structure Design parameter;
If the result of calculation in application life of described asphalt pavement structure is less than selected design period, re-execute step (7), increase Laminate construction thickness or use other structural material instead;
If described asphalt pavement structure application life result of calculation much larger than selected design period, re-execute step (7), reduce Laminate construction thickness.
A kind of pavement design method that guarantees service life of heavy-duty traffic asphalt pavement provided by the invention, compared with prior art has advantages of as follows:
The present invention has considered the impact of Heavy Traffic Condition on Asphalt Pavement material behavior and parameter value, considered the nonlinear characteristic of asphalt pavement material, effectively guaranteed the unification of asphalt pavement material design parameters and true stress state of strain, more can embody the actual forced status of flexible pavement under Heavy Traffic effect, selected bituminous pavement design parameter tallies with the actual situation more.Each Laminate construction thickness and modulus (rigidity) have been taken into full account simultaneously, the affect rule of soil modulus on application life, provided each influence coefficient computation model, improved the precision of flexible pavement calculating in application life, having supplemented < < bituminous pavement design for highway standard > > determines heavy-duty traffic asphalt pavement design is inapplicable, and can carry and traffic volume situation according to disalignment, the application life of the flexible pavement in the various deck parameter of real-time assessment situation, for highway, relevant departments provide design, maintenance and administration base, improve the designing quality of flexible pavement, guarantee its application life.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of pavement design method that guarantees service life of heavy-duty traffic asphalt pavement provided by the invention.
The specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
The embodiment of the present invention has taken into full account the nonlinear characteristic of ground surface material under Heavy Traffic effect, design and calculation method more can embody the actual forced status of flexible pavement under Heavy Traffic effect, more tallying with the actual situation of selected pavement design parameter, can carry and traffic volume situation according to disalignment, implement the application life of the flexible pavement in the various deck parameter situations of assessment, design the road structure that can guarantee service life of heavy-duty traffic asphalt pavement.In addition, some other Analyzing Design Procedures for Asphalt Pavement is often only directed to specified conditions, as: under a certain road structure, axle carries relation with application life etc., can not apply.In reality, different regions, the axle of different periods carries and traffic constantly changes, widely different, want to guarantee the application life of flexible pavement under Heavy Traffic condition, need to be grasped and affect the parameter in flexible pavement application life and affect rule, and the situation in application life of real-time assessment flexible pavement, this first just needs by test, the technical characteristic of asphalt pavement material under the effect of research Heavy Traffic, to reasonable selection bituminous pavement design parameter, and then the flexible pavement computation model in application life under structure Heavy Traffic condition, determine that each parameter is to the flexible pavement influence coefficient in application life, this is also embodiment of the present invention technical problem to be solved.
101: under different loads condition, flexible pavement is carried out to performance evaluation and test, obtain the stress of asphalt pavement material and deformation characteristic, fatigue properties;
Wherein, this step is specially: pass through system test, stress-strain characteristics, the fatigue properties of asphalt pavement material under the different loading conditions of Analysis deterrmination, obtain asphalt pavement material and be subject to the stress of asphalt pavement material under force parameter, deformation parameter, tired parameter, particularly Heavy Traffic condition and deformation characteristic, fatigue properties.This step is determined the stressed and deformation characteristic (compression rebound modulu, compressive strength, cleavage strength, flexural tensile strength and modulus etc.) of asphalt pavement material (bituminous mixture, cement stabilized macadam, two-ash broken stones, two-ash soil and rendzinas etc.) under different loading conditions by system test, specifies the stressed impact with the technical characteristic such as distortion of Heavy Traffic Condition on Asphalt Pavement material.
Wherein, under Heavy Traffic condition (axle carries and is greater than 130KN), the stressed and deformation characteristic of ground surface material shows significant non-linear feature, is different from the elastic performance of conventional design hypothesis.
Wherein, by fatigue test, determine the fatigue life of flexible pavement under different stress levels, specify fatigue behaviour and the technical data thereof of asphalt pavement material.
102: according to the axle on the stress of asphalt pavement material and deformation characteristic, fatigue properties and design road surface, carry situation, the design parameters of selected asphalt pavement material;
Wherein, according to the test of step 101 and analysis result, the axle on design road surface carries situation, the design parameters (for example: compression rebound modulu and intensity etc.) of the asphalt pavement material under the design parameters of reasonable selection asphalt pavement material, particularly Heavy Traffic condition.
Wherein, according to the test of step 101 and analysis result, known asphalt pavement material has nonlinear characteristic (particularly under Heavy Traffic condition, nonlinear characteristic is obvious), and the ground surface material design parameters under disalignment carrier strip part is not quite similar, and must carry situation reasonable selection according to axle.For example: the compression rebound modulu value of cement stabilized macadam when stress level is 0.7MPa (axle carries 100KN) is 1597MPa, and the compression rebound modulu value of stress level while being 1.0MPa (axle carries 140KN) is 1913MPa, other ground surface material has similar features.And under general linear elasticity assumed condition, the compression rebound modulu value of cement stabilized macadam is constant.
103: according to the mechanical characteristic of the Analysis on Design Parameters asphalt pavement structure of asphalt pavement material;
Wherein, this step is to analyze the mechanical characteristic of the lower asphalt pavement structure of the disalignment effect of carrying, that is:, according to the selected asphalt pavement material design parameters of step 102, the mechanical response carrying out under load calculates.
Wherein, this step is calculated disalignment and is carried under effect, the deformation characteristic of the asphalt pavement structure of different structure combination, the Changing Pattern that clear and definite flexure carries with axle; This step is calculated disalignment and is carried under effect, the mechanical characteristic of the each level of flexible pavement, it is the Changing Pattern that the each deck tensile stress at the bottom of layer of flexible pavement or compressive stress, each deck shear stress carry with axle, specify the impact on the suffered stress of the each deck of flexible pavement under Heavy Traffic condition, specify the Changing Pattern of the lower each deck tensile stress at the bottom of layer of the disalignment effect of carrying.This step is calculated in different structure layer thickness and different compression rebound modulu situation, and the stressed and deformation characteristic of asphalt pavement structure is specified thickness and the compression rebound modulu rule that affects on flexible pavement distortion and stressing conditions.This step is also calculated the flexible pavement call parameter in application life (for example: deflection value, tensile stress at the bottom of layer etc.).
104: build flexible pavement computation model in application life under Heavy Traffic condition;
Wherein, can be subject to axle the application life of flexible pavement carries, Laminate construction thickness (surface thickness, groundwork thickness and subbase thickness), deck rigidity (surface thickness, groundwork thickness and subbase thickness), the impact of the factors such as soil modulus, that is: be that axle carries the application life of flexible pavement, road structure layer thickness, the function of rigidity and soil modulus, asphalt pavement material parameter and the mechanical characteristic definite according to step 101～103, clear and definite flexible pavement technical characterictic under Heavy Traffic condition, construct flexible pavement computation model in application life under Heavy Traffic condition.
105: analysis road structure layer thickness (surface thickness, groundwork thickness and subbase thickness), rigidity (surface layer modulus, basic unit's modulus and subbase modulus), soil modulus, axle carry the sensitiveness on flexible pavement impact in application life, determine the calculating parameter of flexible pavement computation model in application life;
Wherein, for definite a kind of factor is on the flexible pavement impact in application life, first suppose that other factors is constant, calculate the variation of this factor to the flexible pavement impact in application life, specify its rule.For example: in order to determine the impact of surface thickness on application life, first suppose that axle carries, surface layer layer modulus, basic unit and subbase thickness, basic unit and subbase modulus, soil modulus be constant, calculating surface thickness changes the flexible pavement impact in application life, determine that it affects rule, provide the function of influence factor.Then apply identical method and determine that other factors is to the flexible pavement influence coefficient computing function in application life.
Wherein, this flexible pavement application life computation model calculating parameter comprise:
Surface thickness is to influence coefficient computation model in application life:
C
1＝0.9953e
0.0757(H-18)
In formula: C
1---surface thickness is to the flexible pavement influence coefficient in application life;
H---surface thickness (cm).
Surface layer modulus is to influence coefficient computation model in application life:
C
2＝1.03×10
-3(E-1200)+1.0016
In formula: C
2---surface layer modulus is to the flexible pavement influence coefficient in application life;
E---surface layer compression rebound modulu (MPa).
Subbase thickness is to influence coefficient computation model in application life:
C
3＝0.9937e
0.0656(H′-20)
In formula: C
3---subbase thickness is to the flexible pavement influence coefficient in application life;
H '---subbase thickness (cm).
Subbase modulus is to influence coefficient computation model in application life:
C
4＝1.002×10
-3(E
1-750)+1.0026
In formula: C
4---subbase modulus is to the flexible pavement influence coefficient in application life;
E
1---subbase compression rebound modulu (MPa).
Groundwork thickness is to influence coefficient computation model in application life:
C
5＝0.9824e
0.0828(h-40)
In formula: C
5---groundwork thickness is to the flexible pavement influence coefficient in application life;
H---groundwork thickness (cm).
Basic unit's modulus is to influence coefficient computation model in application life:
C
6＝8.581×10
-4(E
2-1500)+1.0024
In formula: C
6---basic unit's modulus is to the flexible pavement influence coefficient in application life;
E
2---basic unit's compression rebound modulu (MPa).
Soil modulus is to influence coefficient computation model in application life:
C
7＝0.0607(E
0-40)+0.9439
In formula: C
7---soil modulus is to the flexible pavement influence coefficient in application life;
E
0---Rebound Modulus of Subgrade (MPa).
Axle carries affecting computation model application life:
f(P)＝7.7776×10
19×P
-6.0559
In formula: f (P)---axle carries the flexible pavement influence coefficient in application life;
P---axle carries (KN).
Set up flexible pavement computation model in application life under Heavy Traffic condition:
N
e＝C
1×C
2×C
3×C
4×C
5×C
6×C
7×f(P)
N
e＝0.9953e
0.0757(H-18)×[0.00103(E-1200)+1.0016]×0.9937e
0.0656(H′-20)×[1.002×10
-3(E
1-750)+1.0026]×0.9824e
0.0828(h-40)×[8.581×10
-4(E
2-1500)+1.0024]×[0.0607(E
0-40)+0.9439]×7.7776×10
19P
-6.0559＝7.5569×10
19P
-0.60569×(0.00103E-0.2344)·(1.002×10
-3E
1+0.2511)·(8.581×10
-4E
2-0.2848)·(0.0607E
0-1.4787)×e
0.0757H+0.0656H′+0.0828h-5.9866
106: flexible pavement computation model in application life under heavily loaded transportation condition is tested, if upcheck, apply this model, execution step 107; If check is not passed through, re-execute step 104;
Wherein, the method that computation model is tested application life of flexible pavement under heavily loaded transportation condition is had to two kinds conventionally, (1) the long-term follow monitoring result to flexible pavement use state according to highway maintenance management department, draw the actual life of flexible pavement, by in this flexible pavement and parameters of loading substitution computation model, calculate flexible pavement application life, the error amount of analytical calculation application life and actual life; (2) chamber accelerating and loading test by experiment, in the application life of calculating certain flexible pavement, compares it with the result of calculation of service life of heavy-duty traffic asphalt pavement computation model, analyze error amount between the two.If error can be accepted, upcheck; Otherwise, re-execute step 104.
107: just intend asphalt pavement structure;
Wherein, the axle that bound bitumen road surface need to be born carries and the traffic volume and selected bituminous pavement design service life, tentatively drafts asphalt pavement structure, comprises deck type and thickness etc.
Wherein, while just intending asphalt pavement structure, about selecting of the bituminous pavement design time limit, can select according to the general recommendation of standard, the embodiment of the present invention can according to actual needs, be made design period by oneself, and the selected asphalt pavement structure adapting accordingly, for example: provisional flexible pavement can be selected shorter design period, and there is the flexible pavement of long-life demand, can select longer design period.
108: according to the application life that under Heavy Traffic condition, asphalt pavement structure is just intended in the assessment of flexible pavement computation model in application life;
109: according to the result of calculation in application life of asphalt pavement structure, revise or optimize and just determine scheme, determining Asphalt Pavement Structure Design parameter.
Wherein, if the result of calculation in application life of asphalt pavement structure is consistent with selected design period, directly according to just determining scheme, determine road structure parameter.
Wherein, if the result of calculation in application life of asphalt pavement structure is less than selected design period, re-execute step 107, increase Laminate construction thickness or use other quality structure layer material instead.
Wherein, if asphalt pavement structure application life result of calculation much larger than selected design period, re-execute step 107, reduce Laminate construction thickness, to meeting the maximum economic benefit of obtaining pavement design under the prerequisite that design service life gets.
In sum, compared with prior art, the embodiment of the present invention has been considered the impact of Heavy Traffic Condition on Asphalt Pavement material behavior and parameter value, considered the nonlinear characteristic of asphalt pavement material, effectively guaranteed the unification of asphalt pavement material design parameters and true stress state of strain, more can embody the actual forced status of flexible pavement under Heavy Traffic effect, selected bituminous pavement design parameter tallies with the actual situation more.Each Laminate construction thickness and modulus (rigidity) have been taken into full account simultaneously, the affect rule of soil modulus on application life, provided each influence coefficient computation model, improved the precision of flexible pavement calculating in application life, having supplemented < < bituminous pavement design for highway standard > > determines heavy-duty traffic asphalt pavement design is inapplicable, and can carry and traffic volume situation according to disalignment, the application life of the flexible pavement in the various deck parameter of real-time assessment situation, for highway, relevant departments provide design, maintenance and administration base, improve the designing quality of flexible pavement, guarantee its application life.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. a pavement design method that guarantees service life of heavy-duty traffic asphalt pavement, is characterized in that, said method comprising the steps of:
(1) under different loads condition, flexible pavement is carried out to performance evaluation and test, obtain the stress of asphalt pavement material and deformation characteristic, fatigue properties;
(2) according to the axle on the stress of described asphalt pavement material and deformation characteristic, fatigue properties and design road surface, carry situation, the design parameters of selected asphalt pavement material;
(3) according to the mechanical characteristic of the Analysis on Design Parameters asphalt pavement structure of asphalt pavement material;
(4) build flexible pavement computation model in application life under Heavy Traffic condition;
(5) analysis road structure layer thickness, rigidity, soil modulus, axle carry the sensitiveness on flexible pavement impact in application life, determine the calculating parameter of flexible pavement computation model in application life;
Wherein, described flexible pavement application life computation model calculating parameter comprise:
Surface thickness is to influence coefficient computation model in application life:
C
1=0.9953e
0.0757(H-18)
In formula: C
1---surface thickness is to the flexible pavement influence coefficient in application life;
H---surface thickness (cm);
Surface layer modulus is to influence coefficient computation model in application life:
C
2=1.03×10
-3(E-1200)+1.0016
In formula: C
2---surface layer modulus is to the flexible pavement influence coefficient in application life;
E---surface layer compression rebound modulu (MPa);
Subbase thickness is to influence coefficient computation model in application life:
C
3=0.9937e
0.0656(H′-20)
In formula: C
3---subbase thickness is to the flexible pavement influence coefficient in application life;
H '---subbase thickness (cm);
Subbase modulus is to influence coefficient computation model in application life:
C
4=1.002×10
-3(E
1-750)+1.0026
In formula: C
4---subbase modulus is to the flexible pavement influence coefficient in application life;
E
1---subbase compression rebound modulu (MPa);
Groundwork thickness is to influence coefficient computation model in application life:
C
5=0.9824e
0.0828(h-40)
In formula: C
5---groundwork thickness is to the flexible pavement influence coefficient in application life;
H---groundwork thickness (cm);
Basic unit's modulus is to influence coefficient computation model in application life:
C
6=8.581×10
-4(E
2-1500)+1.0024
In formula: C
6---basic unit's modulus is to the flexible pavement influence coefficient in application life;
E
2---basic unit's compression rebound modulu (MPa);
Soil modulus is to influence coefficient computation model in application life:
C
7=0.0607(E
0-40)+0.9439
In formula: C
7---soil modulus is to the flexible pavement influence coefficient in application life;
E
0---Rebound Modulus of Subgrade (MPa);
Axle carries affecting computation model application life:
f(P)=7.7776×10
19×P
-6.0559
In formula: f (P)---axle carries the flexible pavement influence coefficient in application life;
P---axle carries (KN);
Set up flexible pavement computation model in application life under Heavy Traffic condition:
N
e=C
1×C
2×C
3×C
4×C
5×C
6×C
7×f(P)
N
e=0.9953e
0.0757(H-18)×[0.00103(E-1200)+1.0016]×0.9937e
0.0656(H′-20)
×[1.002×10
-3(E
1-750)+1.0026]×0.9824e
0.0828(h-40)×[8.581×10
-4(E
2-1500)+1.0024]
×[0.0607(E
0-40)+0.9439]×7.7776×10
19P
-6.0559
=7.5569×10
19P
-0.60569×(0.00103E-0.2344)·(1.002×10
-3E
1+0.2511)·(8.581×10
-4E
2-0.2848)
·(0.0607E
0-1.4787)×e
0.0757H+0.0656H′+0.0828h-5.9866
(6) flexible pavement computation model in application life under described Heavy Traffic condition is tested, if upcheck, apply this model, execution step (7); If check is not passed through, re-execute step (4);
(7) just intend asphalt pavement structure;
(8) according to the application life of the first plan of flexible pavement computation model in application life assessment asphalt pavement structure under Heavy Traffic condition;
(9) according to the result of calculation in application life of asphalt pavement structure, revise or optimize and just determine scheme, determine Asphalt Pavement Structure Design parameter.
2. a kind of pavement design method that guarantees service life of heavy-duty traffic asphalt pavement according to claim 1, it is characterized in that, described in step (9) according to the result of calculation in application life of asphalt pavement structure, revise or optimize and just determine scheme, determining that the step of Asphalt Pavement Structure Design parameter is specially:
If the result of calculation in application life of described asphalt pavement structure is consistent with selected design period, directly according to determining scheme at the beginning of described, determine described Pavement Structure Design parameter;
If the result of calculation in application life of described asphalt pavement structure is less than selected design period, increase Laminate construction thickness or use other structural material instead, re-execute step (7);
If described asphalt pavement structure application life result of calculation much larger than selected design period, reduce Laminate construction thickness, re-execute step (7).
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| CN108660880B (en) * | 2018-03-28 | 2020-04-28 | 扬州大学 | Method for determining optimal modulus combination of asphalt pavement structure layer |
| CN108517735B (en) * | 2018-04-12 | 2020-02-07 | 长沙理工大学 | Durability asphalt pavement design method based on double-modulus theory and pavement structure thereof |
| CN114164721B (en) * | 2021-11-22 | 2023-05-09 | 山东高速股份有限公司 | Roadbed and pavement balance design structure method |
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